Concrete-reinforcing bar.



No.881 ,61 8'. PATENTED MAR.10,1908.

w w. w. RAMSEY.

CONCRETE REINPORGING' BAR.

APPLICATION FILED SEPT. 4, 1907.

@TATE PATENT ent es.

\\'ll.l,lA.\l W. RAHSEY, OF t'lllt 'ntit), ILLINOIS.

CONCRE TE-REINFORCING BAR.

Specification of Letters Patent.

Patented March 10, 1908.

Application filed September 4, 1907. Serial No. 391,378.

ments in Concrete-Reinforcing Bars, of which 1 the following is a specificationf lalso prefer to give the tops of the wings or This invention is an improvement in the construction of reinforcing bars used-in concrete structures and its object has been to i provide a bar having the requisite strength dinal movement in the concrete and to withstand the untwisting action upon it of the concrete.

The nature of the invention clearly appears 1n the subjoined description and also in the accompanying drawing forming a part hereof.

In said drawing, Figures 1 and 2 are respectively side and plan views of my improved bar, Fig. 3 is a section on the line 3-3 of Fig. 1. Fig. 4 shows the bar twisted, and Fig. 5 is a perspective showing it with the crowns of the longitudinal ridges given an irregular or wavy outline. I

My improved bar preferably forms a substantially rectangular figure in cross section and it is deeply grooved lengthwise along its top and bottom, as shown in the drawing. The body of the bar is shown at (i and the grooves at 7, 7. The grooves form ridges 8, 8 ppon said top and bottom faces, and the side faces of the bar 9 are preferably con.- caved somewhat as appears clearly in Fig. 3. The bottoms of the grooves are desirably made-sharp, though that is not an, essential 1 feature. The ridges act to give the bar great stillness and compressive strength, as they act as trusses to the central body of the bar, and i also make them to resist any rehi tive movement of either the bar or the concrete in directions longitudinal of the former, by twisting the barss seen at Fig. 4. Each of the ridges is thus caused to present a continuons shoulder to the concrete throughout the whole length of the bar, and with four such shoulders resisting endwise thrustupon the bar in both directions, it will be seen that there can be no relative movement by either the bar or the concrete, My bar is also adapted to resist unwinding, as the concrete bears equally upon both sides of the wings or ridges 8, wit 1 equal force, so that,

combined with the ability to resist longitnthe pressure upon one side neutralizes that upon the other.

The area presented to the concrete by the bar is much greater than that obtain 3d in previous constructions, and hence the bar }S rendered more e'llicie-nt in proportion to the amount of metal embodied in it.

ridges an irregular or wavy outline as seen at Fig. 5. This also tends to prevent longitudinal i novement. It is also desirable that the tops of the ridges be rounded in the roll mg so that they may have no tendency to split the concrete. it will be noted that the grooves 7 are deep. This renders the ridges high and gives them large contact surfaces, which are made spiral by the twisting.

I claim '1. The concrete reinforcing bar consisting of an angular bar of metal and having two of its opposite sides furnished with deep central grooves forming a-ch two longitudinal ridges or wings b at each side of the grooves, E the other two sides of the bar being substantially flat, and the bar having a solid central portion of substantially cross-sectional area between the bottoms of said grooves, substantially as specified.

2. The concrete reinforcing bar consisting of an angular bar of metal and having two of its opposite sides furnished with deep central grooves forming each two longitudinal ridges or wings S at each side of the grooves, the other two sides of the bar being substantially flat, and the bar having a solid central portion of substantially cross-sectional area between the bottoms of said grooves, the tops of said ridges or wings being irregular or wavy, substantially as specified.

3. The concrete reinforcing bar consisting ofan angular bar of metal and having two of its opposite'sides furnished with deep central grooves forming each two longitudinal ridges or wings 8 at each side of the grooves, the other two sides of the bar bein substantially flat, and the bar having a so id central )ortion of substantially cross-sectional area between the bottoms of said grooves, the tops of said ridges or wings being irregular or wavy and the' bar being twisted rendering;

vgrow es forming each two longitudinal rid es 01 wings spiral, suhstantiuny 21s s vm ridges or wings 8 at each side of the grooves, fie the other two sides of the bar'bein suhstim- 1 t tially flat, and the bar having a so id central IMTX'AM MANN) I 5 ortion of su'bstantidll cross-sectional area itnesses:

etween the bottoms ofsaid grooves, and EDW. S. EvAR'rs. said bar being twisted so as to render the said H.-M. MUNDAY. 

